I lost over 80% of my hearing while in the service, pretty much across all frequencies. Also got tinnitus to go with it. It's a pretty cool combo to have. If it's dead quiet, like hunting alone in the woods, I can hear pretty good. But *any* machinery, motor, background or fan noises and I'm deaf as a post. I also will not be able to hear you in a noisy bar or restaurant. Hearing loss/deafness is a physical disability just like any other, with the exception that you can't visually see the person's disability. So if you don't know them, you don't know they can't hear you.
I will usually tell someone when I meet them that I'm almost deaf, and they'll have to speak up, and actually ENUNCIATE their words or I can't hear them. Most folks take it in stride and do their best to accommodate. New coworkers I let know that if they walk by and say something or greeting or similar and I don't respond, it's probably because I can't hear them and not that I'm mad or don't like them or something like that. The random people that I interact with during the day that make no effort to accommodate only get reminded a few times and then they get set to "ignore". I'm only going to be somewhat apologetic for my disability. If they're being a tool about it, I ask them if they'd give some blind guy crap for being blind, or some guy in a wheel chair crap for not walking. I heard Rush Limbaugh say one time about his deafness that no one would walk up to Ray Charles and tell him to try harder to see.
Some folks like to blame the disabled person for not hearing, saying things like "Pay attention" or "listen up". They then will get the "Ray Charles" analogy from me and it usually makes them stop and think about what they just said to me.
My wife of almost 35 years knows me and knows my condition well. She knows that if she asks me something or says something and I don't respond or react it means I didn't hear her. She's very understanding and forgiving. She's also been around since before I went nearly deaf, and she knows the circumstances of how-why, so it's no big deal to her. She'll still tease me about it sometimes, which is fine, calling me "deaf old man" or similar, and we chuckle about it. I love that woman. Rest of my family knows I'm hard of hearing too and they also do their best to accommodate. Only one I had a permanent problem with was my (now ex) Sister-in-Law. That woman spoke nothing but "A's". Every word, every syllable out of her mouth was just the letter "A". No consonants, and no other vowels, no attempt at annunciation at all. It was impossible to understand her, especially on the phone. I would just ask "Is my brother there, and can you put him on the phone?" I don't have to talk to her anymore, so it's "fixed" now. Lol.
Amplification would do very little for me. I would need improved clarity. I can usually (not always) tell that someone spoke, unless they're faced away from me, but I would have to say "I can tell some words just went by me, but I didn't understand any of them. Can you repeat that?" I'm not really interested in getting hearing aids, at least not for now. Maybe once it gets so bad I can't communicate. But I'm not really interested in spending $6-8K for high end hearing aids to hear random strangers speak to me about things I may not be interested in anyway. I know they're trying to reach me about my car's warranty, but at least right now I don't have to hear it.